EP0774368B1 - Pneumatic tyre - Google Patents

Pneumatic tyre Download PDF

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Publication number
EP0774368B1
EP0774368B1 EP96308153A EP96308153A EP0774368B1 EP 0774368 B1 EP0774368 B1 EP 0774368B1 EP 96308153 A EP96308153 A EP 96308153A EP 96308153 A EP96308153 A EP 96308153A EP 0774368 B1 EP0774368 B1 EP 0774368B1
Authority
EP
European Patent Office
Prior art keywords
bead
ribs
tyre
tyre according
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96308153A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0774368A1 (en
Inventor
John Anthony Turley
Arthur Roger Williams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9523275.7A external-priority patent/GB9523275D0/en
Priority claimed from GBGB9619870.0A external-priority patent/GB9619870D0/en
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP0774368A1 publication Critical patent/EP0774368A1/en
Application granted granted Critical
Publication of EP0774368B1 publication Critical patent/EP0774368B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B60C15/024—Bead contour, e.g. lips, grooves, or ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
    • B60C5/16—Sealing means between beads and rims, e.g. bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C2019/008—Venting means, e.g. for expelling entrapped air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire

Definitions

  • This invention relates to a pneumatic tyre of the type having a radial construction.
  • Such joints may be overlap joints or butt joints.
  • Fabric reinforced components are normally overlapped at the joint whereas steel reinforced components are usually butted.
  • Non-reinforced rubber components such as the tread, sidewall and clinch components are usually butted with an overlapping scarf joint.
  • component joints may have an excess of material or in the case of rubber components a scarcity of material dependent on the tolerance of the cut length.
  • a tyre having ridges on the bead base, in accordance with the preamble of claim 1, to improve resistance to coming off the wheelrim is known for example from JP-A-07069010.
  • a radial tyre comprising a tyre carcass comprising a strip of circumferentially extending material jointed at the ends and comprising reinforcing cords extending between two bead regions and enclosed therein by wrapping around a circumferentially extending inextensible bead core, the axially outer surface of each bead region comprising a bead seat radially inward of the bead core for seating onto the bead seat of a wheelrim terminating at a bead toe at the axial inward end of the bead seat, a bead clinch extending substantially radially outwardly and located axially outwardly of the bead core and bead heel extending between the radially inward end of the bead clinch and the axially outward end of the bead seat, the bead regions having a bead base width being the axial distance between the bead toe and a bead heel point,
  • the ribs are continuous around the circumference of the tyre bead.
  • the ribs preferably project outward from the bead region outer surface by a distance which is not greater than 8%, or more preferably 3%, of the bead base width.
  • the ribs have a maximum width of between 5 arid 15%, or most preferably 10%, of the bead base width.
  • the ribs may have their maximum width across the base and may have their maximum projecting distance at a single point on the rib surface lying nearest the edge of the rib nearest the bead toe.
  • the tyre may have ribs on the bead base and may have ribs on the bead heel.
  • Figure 1 shows the construction of a 165R13 size passenger vehicle tyre according to the present invention.
  • the tyre construction comprises a single reinforcing ply 1 extending through a tread region 3 to bead regions 2 wherein it is anchored by being turned up around an inextensible bead core 4 from the axially inside to the outside to form ply turn-ups 5.
  • a tapering hard rubber apex 6 is disposed radially outward of the bead core 4 and between the ply 1 and the ply turn-up 5 to stiffen the bead region 2.
  • On the axially outer side of the ply turn-up 5 is disposed a rubber clinch strip 7 to prevent chafing against the flange of the wheel rim.
  • the ground contacting tread region 3 of the tyre has a patterned rubber tread 8 and a reinforcing breaker 9 disposed radially inward to the tread 8 and outward of the ply 1.
  • an innerlining 10 comprising a rubber of high impermeability to air and moisture for the purpose of retaining the inflation air.
  • the ply 1 passes through sidewall regions 11 and is protected by a sidewall rubber 12.
  • Figures 2 and 3 show detail of the bead region 2 of the tyre of Figure 1.
  • the outside of the bead region 2 comprises a double tapered bead seat BS, for seating on a wheelrim, lying radially inside the bead coil 4, a bead clinch BC lying axially outward of the bead coil and extending substantially radially outwardly and between the bead seat BS and bead clinch BC a curved bead heel BH.
  • the double tapered bead sear BS comprises an axially outer first taper portion BS1 inclined at a relatively small angle ⁇ 1 to the tyre axial direction and an axially inner second taper portion BS2 inclined at a larger angle ⁇ 2 .
  • the bead region has a bead base width (or J dimension) of 14mm being the axial distance between the bead toe BT at the axially inner end of the bead seat BS and the theoretical bead heel point BHP, which is a notional point on the designated diameter BD vertically below the vertical portion of the tyre bead clinch BC or vertically below the point of inflexion of the bead clinch BC.
  • the bead region 2 has six ribs R1-R6 projecting from the outer surface of the bead and extending circumferentially around the entire circumference of the tyre.
  • three ribs R1-R3 are provided on the bead heel BH and three ribs R4-R6 are provided on the bead seat BS.
  • each rib has a maximum width RW measured along the bead surface between the axially outer and inner base edges OE and IE respectively of 1.4mm.
  • the outer surface of the rib between the base edges OE and IE is a single surface without edges having a contour defined by a circular arc of radius 0.4mm and a straight line meeting tangentially. Accordingly the rib has a maximum projecting distance PD of 0.4mm at a single point MP which is nearest to the axially inner base IE, that is the distance MD of the point MP of the maximum projecting distance PD from the axially inner base edge IE is less than half of the rib width RW.
  • the six ribs R1-R6 are equally spaced apart along the bead outer surface.
  • a batch of twenty experimental tyres in accordance with the invention and a batch of twenty standard tyres for comparison were prepared.
  • a batch of forty green tyre cases were assembled by the same operator using the same building machine and tyre components from the same batch.
  • Twenty of these uncured cases were moulded in a 165R13 size mould in which the mould bead rings had been modified to have six grooves having position and shape complementary to the six ribs R1-R6 shown in Figure 2.
  • the outside of the bead region 2 of a truck tyre comprises a double tapered bead seat BS, for seating on a wheelrim, lying radially inside the bead coil 4, a bead clinch BC lying axially outward of the bead coil and extending substantially radially outwardly and between the bead seat BS and bead clinch BC a curved bead heel BH.
  • the bead region 2 is provided with ten ribs R1-R10 projecting from the outer surface of the bead and extending circumferentially around the entire circumference of the tyre.
  • three ribs R1-R3 are provided on the bead heel BH and seven ribs R4-R10 are provided on the bead seat BS.
  • Figure 6 shows the bead of a motorcycle tyre having two such circumferentially extending ribs R21 and R22, provided one each in the bead heel and bead seat regions respectively.
  • Tyres having the beads illustrated in Figures 5 and 6 have been extensively tested in comparison to similar conventional tyres and have shown improved levels of uniformity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP96308153A 1995-11-14 1996-11-12 Pneumatic tyre Expired - Lifetime EP0774368B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9523275 1995-11-14
GBGB9523275.7A GB9523275D0 (en) 1995-11-14 1995-11-14 Pneumatic tyre
GBGB9619870.0A GB9619870D0 (en) 1996-09-24 1996-09-24 Pneumatic tyre
GB9619870 1996-09-24

Publications (2)

Publication Number Publication Date
EP0774368A1 EP0774368A1 (en) 1997-05-21
EP0774368B1 true EP0774368B1 (en) 2000-01-19

Family

ID=26308116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96308153A Expired - Lifetime EP0774368B1 (en) 1995-11-14 1996-11-12 Pneumatic tyre

Country Status (4)

Country Link
US (1) US5769981A (ja)
EP (1) EP0774368B1 (ja)
JP (1) JP3165647B2 (ja)
DE (1) DE69606267T2 (ja)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2781723B1 (fr) * 1998-07-28 2000-09-01 Michelin Soc Tech Bourrelet de pneumatique radial
US6929046B1 (en) 1999-12-16 2005-08-16 The Goodyear Tire & Rubber Company Tire in with cavities in bead region
EP1242253B1 (en) * 1999-12-16 2005-05-18 The Goodyear Tire & Rubber Company Tire with cavities in bead region
BR0101507A (pt) * 2000-04-28 2001-11-27 Goodyear Tire & Rubber Perfil de talão para pneumáticos
US7682353B2 (en) * 2001-06-29 2010-03-23 Coloplast A/S Catheter device
JP4299516B2 (ja) * 2002-09-04 2009-07-22 住友ゴム工業株式会社 空気入りタイヤの製造方法及びタイヤ加硫金型
FR2879966B1 (fr) * 2004-12-24 2009-03-06 Michelin Soc Tech Pneumatique et jante dont au moins un siege comporte une nervure
EP1911607B1 (en) * 2005-08-02 2011-03-23 Bridgestone Corporation Pneumatic radial tire for heavy load
KR100839734B1 (ko) * 2007-03-30 2008-06-19 금호타이어 주식회사 공기입 타이어의 비드부 구조
US8627866B2 (en) * 2009-01-09 2014-01-14 Bridgestone Americas Tire Operations, Llc Tire and wheel rim assembly
US8011235B2 (en) * 2009-04-16 2011-09-06 Bridgestone Americas Tire Operations, Llc Apparatus and method for measuring local tire stiffness
US8286680B2 (en) * 2009-04-28 2012-10-16 Bridgestone Americas Tire Operations, Llc Tire with circumferential grooves in the bead region
US8746318B2 (en) * 2010-03-15 2014-06-10 Clinton Robert Clark Tire bead seating method and apparatus
CN106114074A (zh) * 2016-08-27 2016-11-16 厦门正新橡胶工业有限公司 轮胎胎唇结构
JP6932497B2 (ja) * 2016-12-02 2021-09-08 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
JP7067213B2 (ja) * 2018-04-04 2022-05-16 横浜ゴム株式会社 空気入りタイヤ
JP7119944B2 (ja) * 2018-11-26 2022-08-17 住友ゴム工業株式会社 空気入りタイヤ及び加硫金型
JP7298240B2 (ja) * 2019-03-28 2023-06-27 住友ゴム工業株式会社 空気入りタイヤ
EP3782826B1 (en) * 2019-08-22 2022-04-06 Sumitomo Rubber Industries, Ltd. Pneumatic tire and tire mold
JP7367488B2 (ja) * 2019-11-26 2023-10-24 住友ゴム工業株式会社 空気入りタイヤ

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA646996A (en) * 1962-08-21 The B. F. Goodrich Company Pneumatic tire and method of making the same
US1462517A (en) * 1920-07-06 1923-07-24 Fisk Rubber Co Tire bead and method of making the same
CH295878A (de) * 1943-09-06 1954-01-15 Continental Gummi Werke Ag Fahrzeugrad mit Luftreifen.
US2484620A (en) * 1946-05-28 1949-10-11 Wingfoot Corp Flexible protective cushion for tire chafer area
BE522447A (ja) * 1946-12-14
FR1015316A (fr) * 1949-04-09 1952-09-15 Osterreichisch Amerikanische G Bandage pneumatique pour véhicules automobiles à talon protégé, et moule de vulcanisation pour sa fabrication
US2698042A (en) * 1950-09-13 1954-12-28 Goodrich Co B F Air-sealing tire liner
DE938767C (de) * 1954-12-12 1956-02-09 Continental Gummi Werke Ag Ohne Luftschlauch benutzbarer Fahrzeugluftreifen
BE552399A (ja) * 1955-11-14 1900-01-01
GB848883A (en) * 1955-12-15 1960-09-21 Goodrich Co B F Improvements in tubeless pheumatic tires
JPS62299411A (ja) * 1986-06-20 1987-12-26 Bridgestone Corp 重荷重用空気入りタイヤ
JPH02241808A (ja) * 1989-03-16 1990-09-26 Bridgestone Corp チューブレスタイヤ
JPH0769010A (ja) * 1993-08-31 1995-03-14 Bridgestone Corp 空気入りタイヤ

Also Published As

Publication number Publication date
US5769981A (en) 1998-06-23
DE69606267D1 (de) 2000-02-24
EP0774368A1 (en) 1997-05-21
DE69606267T2 (de) 2000-09-14
JPH09164821A (ja) 1997-06-24
JP3165647B2 (ja) 2001-05-14

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